Geniculate is a term used to describe certain insect antennae. Geniculate antennae are bent or hinged sharply, almost like a knee or elbow joint. The term geniculate derives from the Latin genu, meaning knee.
Geniculate is a morphological form of antennae found in some groups of insects, especially in ants or bees.
Geniculate is just one of many morphological forms of insect antennae. See also:
Source: Borror and DeLong's Introduction to the Study of Insects, 7th Edition, by Charles A. Triplehorn and Norman F. Johnson